PRESENT’S OFFICE, REGIONAL ADMINISTRATION

AND LOCAL GOVERNMENT

SECONDARY SCHOOL EXAMINATION

CHEMISTRY FORM TWO

PRE-NECTA EXAMS– 2025

TIME: 2:30 HRS

INSTRUCTIONS 

1.   Thus paper consists of section A, B and C with total of  ten (10) questions
2.   Answer all questions
3.   All writing must be in blue or Black in except drawing which must be in pencil
4.   Section A and C carry fifteen (15) marks
5.   Cellular phones and any unauthorized material are not allowed in assessment room

SECTION A (15 MARKS)

Answer ALL questions.

i. Which one of the following represent the chemical combination of substances result into the formation of water; 

1.   Magnesium + oxygen  → Magnesium oxide.
2.   Lead (II) Oxide + Hydrogen  → Lead + water
3.   Hydrogen + Oxygen →  Water 
4.  Silver oxide + Hydrogen  → Silver + Water

ii. What is so special with Francium and Fluorine compared to other elements in the periodic table?

1.   Francium is a liquid and Fluorine is a gas
2.   Francium is in group 1 and Fluorine in group 7
3.   Francium is in periodic 7 and Fluorine in period 2
   1. Francium is most electropositive and Fluorine most electronegative.

iii. A mixture of two solid substance is commonly heated in the laboratory  to produce oxygen such mixture could be that of:-

1.   Manganese dioxide, hydrogen and magnesium
2.   Potassium permanganate and magnesium oxide
3.   Mercury (ii) oxide and hydrogen peroxide
4.  Potassium chlorate  and manganese (iv) oxide

iv. What type of displacement is done by collecting pure hydrogen in the laboratory;

1.   Downward displacement of water
2.   Downward displacement of air
3.    Upward displacement air
4.  Upward displacement of air

v. What is kindling temperature 

1. A kind temperature
2. Temperature out of a burning material
3. The highest temperature obtained from a burning substance
4. The lowest temperature at which a combustible material can catch fire.

vi. Which element will form a compound of the formular M2O3 where M is a metal?

1.   Aluminium and  Oxygen
2.   Beryllium and chlorine
3.   Oxygen and Sodium
4.  Calcium and oxygen.

viii. What is so unique about a hydrogen atom on comparing it with other elements? 

1.   It has no neutron in its nucleus
2.   It has a small relative atomic mass
3.   It forms a low density gas
4.  It has no exact place in the Periodic table

ix. Identify the skill not acquired during chemistry study

1.   Careful observation
2.   Accurate reporting
3.   Testing hypothesis experimentally
4.  Map reading skills

x. When one wants to light the Bunsen burner, what is the first thing to do; 

1.   Light a match/wooden splint and hold it at the gas tap using the rubber tubing.
2.   Close air hole and connect the burner to the gas tap using the rubber tubing.
3.   Open the gas tap slowly to half way to fully open position.
4.  Open the  hole slowly

2. Match the items in List A with their corresponding responses in List B. 

SECTION B

3.    (a) List down three (3) sources of natural water.

(b) Explain why water is NOT used to extinguish class E fires.

(c ) Give a reason to support the following facts

1.      Water is universal solvent
2.    Oxygen is collect over water
3.  Oxy-hydrogen used in welding

4. The following are atomic and ionic radii (in nm) of members of the same group of the periodic table use the information to answer the questions that follow. The letters do not represent the actual

1. Is this a group of metallic or non metallic elements? Explain your answer?
2. State the element that would have lowest atomic number.
3. State the element which would be the most reactive. Give a reason for your answer.
4. State the element which would be the most reactive. Give a reason for your answer.

5. Gas “P” has the following properties; it is highly flammable, readily combines with other elements, readily reacts with other chemical substance and is a strong reducing agent.

1.    Name the gas “P”
2.    What is the method used to collect gas “P” in the laboratory? Give reason
3.     Give four (4) uses of gar “P”.

6. (a) write down the chemical formula of the following compounds 

1.      Copper (II) nitrate _____________________________
2.    Sodium hydrogen carbonate _________________________
3.  Aluminium chloride _______________________________

(b) Write the IUPAC names of the following chemical compounds:

(i) H₂SO₄      ________________________________________________

(ii) HCl O₃ __________________________________________________

(iii) Cu₂O ____________________________________________________

7. (a) Which are the three sub – atomic particles;

1.      ……………………………. (ii) …………………………….. (iii) ……………………............

(b) Which sub – atomic particles from the nucleus and what is their common name?

      Particles (i) ……………………………. (ii) …………………………………………

      Common name …………………………………………………….

8. (a) Define:-  (i) Valency  (ii) oxidation state  (iii) Radical.

   (b)   Calculate the oxidation number of the underlined elements:-

 (i) Na₂SO₄   (ii) SO₄^2-  (iii) K₂Cr₂O₇ (iv) NH₄⁺  (v) MnO₄^-

9. (a) Define the following terms;

1.      Water treatment ………………………………………………………………………………………………………………………………………………………………………………
2.    Water purification …………………………………………………………………………………………………………………………………………………………………………………

(b) Name impurities that can be found in water? 

1.           …………………………………………………………………………
2.         …………………………………………………………………………
3.  …………………………………………………………………………
4.  ………………………………………………………………………… 

(c) State any two methods of domestic water treatment;

(i) ……………………………………………………………………………..

 (ii) …………………………………………………………………………….  

SECTION C

10. (a) What is the suitable term in chemistry used for the tendency of an 

electron pair towards itself? …………………………………………………………

(b) Can isolated atoms show the same behaviour? …………………………………….

(c) Which is the suitable term in chemistry used in opposite to the 7(a) and (b) behaviours above? …………………………………………………………………

      ………………………………………………………………………………………

THE OFFICE OF THE PRESIDENT, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT.

SECONDARY EXAMINATION SERIES

MARCH 2025

CHEMISTRY FORM TWO

TIME: 2:30 HRS

INSTRUCTIONS

1.  This paper consists of three(3) sections A, B and C with a total of ten (10) questions
2.  Section A carries fifteen (15) marks, section B seventy (70) marks and section C fifteen (15) marks.
3. Answer ALL questions in all sections
4. Write your names and stream on the top center in every page of your examination
5. ALL answers should appear in this question paper in the space provided.

SECTION A (15 Marks)

(Answer all questions in this section)

1. For each of the items (i)-(x) choose the correct answer from among the given alternative and write its letter besides the item number in the answer booklet provided. (@1mark=10 marks)

(i) Chemistry is one of the sciences which deals with:

1. The study of body cells 
2. Composition,properties and behavior of matter 
3. Chemical changes 
4. Physical changes 

(ii) The process of chlorination in water treatment aims at:

1. Syrup making 
2. Removing bad smell 
3. Killing micro-organisms
4. Formation of suspension

(iii) The atomic number of an element is the:

1. Number of protons 
2. Mass number  
3. Number of neutrons
4. Number of protons and neutrons

(iv) The substance that can burn your skin is best described as:

1. Flammable 
2. Corrosive 
3. Toxic
4. Explosive

(v) One of the following can distinguish hydrogen gas from other gases: 

1. It burns and supports combustion
2. It is colourless and odorless 
3. It gives a smell of a rotten egg
4. It burns with pop sound.

(vi) The following sentences suggest that air is a mixture, except:

1. Its components can be separated physically
2. Its composition varies from one place to another
3. Its properties depends on individual gases
4. Its formation requires absorption or reabsorption of heat.

(vii) The welders prefers to use non luminous flame for their work simply because

1. It is available
2. it is easy to transport
3. produce very hot flame
4. can be made by kerosene

(viii) Spatula in the laboratory is used for scoping what types of substances?

1. Liquid and gases 
2. solids and liquids
3. Powdery and gases 
4. Solids and powdery

(ix) There are two particles inside the nucleus which one contributes the net change of that nucleus?

1. Dalton 
2. Protons
3. Electrons
4. Neutrons

(x) Why oxygen as one of the components of air Is unique?

1. It has ability to burn 
2. it support combustion
3. it is diatonic gas
4. combine with carbon dioxide

2. (a) Choose a word(s) from list B which matches the statement or phrases in list A and write its letter in the space provided.

SECTION C (70) MARKS

3. (a) Define the term rust. (2 marks)

(b) Write down the chemical formula of rust. (2 marks)

(c) Briefly explain why iron in salt water rust faster than in fresh water? (3 marks)

(d) List down three disadvantages of rusting process in our daily life. (3 marks)

4. (a) Give out the reason why oxygen gas is normally collected by the method called downward displacement of water. (2 marks)

(b) Briefly explain how you would test the presence of the following gases in air.

1. Oxygen . (2 marks)
2. Carbon dioxide (2 marks)

(c) With four reasons explain why air is not termed as a compound. (4 marks)

5. The laboratory technician planned to conduct an experiment for the preparation of gas M. He decided to use a pieces of zinc metal and dilute hydrochloric acid.

1. Identify gas M
2. Mention six apparatus that he can use to prepare the gas M.
3.  Write the word equation for the laboratory preparation of gas M.
4. Describe the properties of gas M which relates with its uses. Give two points.

6. (a) Explain the following terms;

1. Physical change
2. Chemical change

(b) Student of form two performing two simple experiments concerning changes of matter on two substances, A and B in the laboratory. In experiment number 1, student changes substance “A” from solid to liquid and in experiment number 2, student changes substance “B” by burning it to form ashes.

(i) Provide one example of each substance between A and B

(ii) What are the four differences between the changes of matter occurred in substance “A” and the changes of matter that occurred in substance “B”

7. a) Identify types of change involved in each of the following. i.e. state whether physical or chemical change,

i) Respiration 

ii) Sublimation 

iii) Combustion 

iv) Distillation

b)Write the chemical symbols of the following elements

i) Potassium 

ii) Sodium 

iii) Mercury 

iv) Gold

c) Write the most suitable method of separating the following mixture.

i) Air
ii) Kerosene and water
iij) Iodine and sand

iv) Syrup

8. A compound consists of 27.3% sodium, 1.2% hydrogen, 14.3% carbon a nd oxygen. Its relative atomic mass is 84

i) Calculate its empirical formula

a. Use the answer in 6(i) to find its molecular formula

ii) State the name of the compound

9. a) Elements ⁴⁰W has 22 neutrons (the letter is not the actual symbols of the element). State the element's:

i) Atomic number

ii) Number of protons

iii) Electronic configuration

iv) Name of element W

b) Element G is in group 7 period 3.

i) Write the atomic number of G

ii) Write the nuclide notation of two isotopes of G

SECTION C (15) MARKS

10. (a) Scientific procedures are steps used by scientists when finding answers to scientific problems. Write the steps which correspond to each of the following.

1. Kelvinia was not feeling well. Shewent to see a medical doctor at Malangali Health Center.
2. The Doctor asked Kelvinia several questions about how she was feeling.
3. The Doctor ordered Kelvinia’s body temperature, blood and urine sample for observation in the laboratory.
4. The laboratory technician diagnosed Malaria parasite in Kelvinia’s blood.
5. The doctor confirmed that Kelvinia had Malaria and prescribed medicine for her.

(b) Why is scientific procedure important? Give two points

(c) State three areas where scientific procedures are applied

PRESENT’S OFFICE, REGIONAL ADMINISTRATION

AND LOCAL GOVERNMENT

SECONDARY EXAMINATION SERIES

CHEMISTRY FORM TWO

MID-TERM EXAMS – AUG/SEPT – 2024

TIME: 2:30 HRS

INSTRUCTIONS 

1.  Thus paper consists of section A, B and C with total of  ten (10) questions
2.  Answer all questions
3.  All writing must be in blue or Black in except drawing which must be in pencil
4.  Section A and C carry fifteen (15) marks
5.  Cellular phones and any unauthorized material are not allowed in assessment room

SECTION A (15 MARKS)

Answer ALL questions.

i. Which one of the following represent the chemical combination of substances result into the formation of water; 

1.  Magnesium + oxygen  → Magnesium oxide.
2.  Lead (II) Oxide + Hydrogen  → Lead + water
3.  Hydrogen + Oxygen →  Water 
4.  Silver oxide + Hydrogen  → Silver + Water

ii. What is so special with Francium and Fluorine compared to other elements in the periodic table?

1.  Francium is a liquid and Fluorine is a gas
2.  Francium is in group 1 and Fluorine in group 7
3.  Francium is in periodic 7 and Fluorine in period 2
   1.   Francium is most electropositive and Fluorine most electronegative.

iii. A mixture of two solid substance is commonly heated in the laboratory  to produce oxygen such mixture could be that of:-

1.  Manganese dioxide, hydrogen and magnesium
2.  Potassium permanganate and magnesium oxide
3.  Mercury (ii) oxide and hydrogen peroxide
4.  Potassium chlorate  and manganese (iv) oxide

iv. What type of displacement is done by collecting pure hydrogen in the laboratory;

1.  Downward displacement of water
2.  Downward displacement of air
3.   Upward displacement air
4.  Upward displacement of air

v. What is kindling temperature 

1. A kind temperature
2. Temperature out of a burning material
3. The highest temperature obtained from a burning substance
4. The lowest temperature at which a combustible material can catch fire.

vi. Which element will form a compound of the formular M2O3 where M is a metal?

1.  Aluminium and  Oxygen
2.  Beryllium and chlorine
3.  Oxygen and Sodium
4.  Calcium and oxygen.

viii. What is so unique about a hydrogen atom on comparing it with other elements? 

1.  It has no neutron in its nucleus
2.  It has a small relative atomic mass
3.  It forms a low density gas
4.  It has no exact place in the Periodic table

ix. Identify the skill not acquired during chemistry study

1.  Careful observation
2.  Accurate reporting
3.  Testing hypothesis experimentally
4.  Map reading skills

x. When one wants to light the Bunsen burner, what is the first thing to do; 

1.  Light a match/wooden splint and hold it at the gas tap using the rubber tubing.
2.  Close air hole and connect the burner to the gas tap using the rubber tubing.
3.  Open the gas tap slowly to half way to fully open position.
4.  Open the  hole slowly

2. Match the items in List A with their corresponding responses in List B. 

SECTION B

3.   (a) List down three (3) sources of natural water.

(b) Explain why water is NOT used to extinguish class E fires.

(c ) Give a reason to support the following facts

1.     Water is universal solvent
2.   Oxygen is collect over water
3.       Oxy-hydrogen used in welding

4. The following are atomic and ionic radii (in nm) of members of the same group of the periodic table use the information to answer the questions that follow. The letters do not represent the actual

1. Is this a group of metallic or non metallic elements? Explain your answer?
2. State the element that would have lowest atomic number.
3. State the element which would be the most reactive. Give a reason for your answer.
4. State the element which would be the most reactive. Give a reason for your answer.

5. Gas “P” has the following properties; it is highly flammable, readily combines with other elements, readily reacts with other chemical substance and is a strong reducing agent.

1.   Name the gas “P”
2.  What is the method used to collect gas “P” in the laboratory? Give reason
3.   Give four (4) uses of gar “P”.

6. (a) write down the chemical formula of the following compounds 

1.     Copper (II) nitrate _____________________________
2.   Sodium hydrogen carbonate _________________________
3.       Aluminium chloride _______________________________

(b) Write the IUPAC names of the following chemical compounds:

(i) H₂SO₄      ________________________________________________

(ii) HCl O₃ __________________________________________________

(iii) Cu₂O ____________________________________________________

7. (a) Which are the three sub – atomic particles;

1.     ……………………………. (ii) …………………………….. (iii) ……………………............

(b) Which sub – atomic particles from the nucleus and what is their common name?

      Particles (i) ……………………………. (ii) …………………………………………

      Common name …………………………………………………….

8. (a) Define:-  (i) Valency  (ii) oxidation state  (iii) Radical.

   (b)   Calculate the oxidation number of the underlined elements:-

 (i) Na₂SO₄   (ii) SO₄^2-  (iii) K₂Cr₂O₇ (iv) NH₄⁺  (v) MnO₄^-

9. (a) Define the following terms;

1.     Water treatment ………………………………………………………………………………………………………………………………………………………………………………
2.   Water purification …………………………………………………………………………………………………………………………………………………………………………………

(b) Name impurities that can be found in water? 

1.          …………………………………………………………………………
2.        …………………………………………………………………………
3.             …………………………………………………………………………
4.             ………………………………………………………………………… 

(c) State any two methods of domestic water treatment;

(i) ……………………………………………………………………………..

 (ii) …………………………………………………………………………….  

SECTION C

10. (a) What is the suitable term in chemistry used for the tendency of an atom to attract an 

    electron pair towards itself? …………………………………………………………

(b) Can isolated atoms show the same behaviour? …………………………………….

(c) Which is the suitable term in chemistry used in opposite to the 7(a) and (b) behaviours above? …………………………………………………………………

      ………………………………………………………………………………………

THE PRESIDENT’S OFFICE

REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

CHEMISTRY FORM TWO PRE- MOCK EXAMINATION

CODE 032

TIME: 2:30 HOURS          

INSTRUCTIONS.

• This paper consists of section A, B and C with the total number of ten(10) questions
• Answer all questions in each section
• Section A carries (15) marks, section B (70) marks and section C carries (15) marks
• All writing must be in blue/black ink except drawing which must be in pencil
• Cellular phones and any unauthorized materials are not allowed in the assessment room.

SECTION A (15 Marks)

Answer all questions in this section

1. For each of the items (i) – (x) choose the correct answer from among the given alternatives and write its letter beside the item number in the answer sheet provided

1.      Which of these is NOT a branch of chemistry?

1. Organic Chemistry
2. Biochemistry
3. Astrology
4. Physical Chemistry

2.    A student mixes two clear liquids and observes a bright yellow solid form and settle at the bottom. This is likely evidence of:

1. Physical change
2. Chemical change 
3. Evaporation
4.  No change occurring

3.  What's the first step if a chemical splashes into a student's eyes in the lab?

1. Rub the eyes vigorously
2. Get the teacher's attention
3. Go directly to the nurse
4. Flush eyes with water at an eyewash station

4.  Which of these is a compound?

1. Copper (Cu)
2. Saltwater
3. Carbon Dioxide (CO2)
4. Air

5.    The main component of the air we breathe is:

1. Oxygen
2. Carbon dioxide
3. Nitrogen
4. Helium

6.  What three conditions are needed for fire to burn?

1. Fuel, water, air
2. Fuel, oxygen, heat
3. Heat, light, water
4. Wind, oxygen, fuel

7.            A Bunsen burner's hottest flame is achieved when it is:

1. Tall and yellow
2. Roaring and blue
3. Short and orange
4. Flickering and red

8.          A glowing splint will relight when placed in a container of pure oxygen. This shows that oxygen:

1. Supports combustion
2. Creates water
3. Is a product of combustion
4. Is not flammable

9.  The characteristic "pop" sound in a hydrogen gas test indicates:

1. Hydrogen forms water quickly
2. Hydrogen is flammable
3. Hydrogen is lighter than air
4. Hydrogen is odorless

10.    Most of an atom's mass is concentrated in the:

1. Nucleus
2. Protons
3. Electrons
4. Electron shells

2. Match the items that tend to rust with the method for preventing it.

SECTION B: 70 MARKS

3.       The diagram below shows the relationship between the physical states of matter. Study it and answer the questions that follow.

1.      Identify the process R,V,W and U       
2.     Name three substances which can undergo the process represented by process S and T.                                                                                                                                                         
   4.       (a) The table below shows liquids that are miscible and those that are immiscible

Liquid    L3    L4

L1    Miscible   Miscible

L2    Miscible   immiscible

Use the information given to answer the questions that follow.

1. Name the method that can be used to separate L1 and L3 from a mixture of the two.                                                                                                                                                          

2. Draw and name an apparatus that can be used to separate a mixture of L2 and L4.                                                                                                                                                         
   2.   Give two reasons why most Laboratory apparatus are made of glass. 
   3.    Name three sources of heat beside Bunsen burner in the laboratory. 

5.       a) Draw a labeled diagram of a non-luminous flame produced by the Bunsen burner                                                                                                                                           

b) State two reasons why a non-luminous flame is preferred for heating. 

c) After use a non-luminous flame should be put off or adjusted to a luminous flame. Explain.                                                                                                                  

6.       (a) Name three apparatus that are used to measure accurate volume of liquids.
   2.   Distinguish between an element and a compound and give an example of each.
   3.    By use of a diagram between a residue and a filtrate.    
7.       (a) Name the method you would use to separate the following mixtures.

1. Sand and ammonium chloride.      
2. Oil and Water.         
3. Kerosene and crude oil        
   2.   Salt and water.        
   3.    Describe how you would separate a mixture of salt, sand and iodine into different components.                                                                                                                             

8.       (a)State the functions of the following apparatus as used in the laboratory.

1.                     Spatula          
2.                   Pine-clay triangle          
3.                 Wire gauze          

b)   Draw and state the use of a deflagrating spoon.    

(c )State the two causes of accidents in a Chemistry laboratory.   (2mks)

9.       (a)Define the following terms

1. Solvent extraction          
2. Hydrated salt          
3. Saturated Solution         
   2.   State two functions of a fume cupboard as found in a chemistry laboratory.

(c)Explain the differences between solid and gaseous states using the theoretical model of matter in terms of the Kinetic theory.                                                                                     

SECTION C: 15 Marks

10.

I. (a) Common table salt is contaminated with copper (ii) oxide. Explain how Pure sodium Chloride can be obtained from the mixture.                                                                       

2.   The table below gives information on some substances. Use it to answer the question that follows.

3.    Which substance has the

1.                     Lowest melting point       

2.                   Highest boiling point        

4.   Which letters represents a substance that is a gas at room temperature?                                                                                                                                                          
5.   Which is a liquid at room temperature and when mixed with water two layers would be formed.                                                                                                               
6.     Which substance dissolves in water and could be separated from the solution by fractional distillation.                                                                                   

2.       a) Give the symbols of the following elements    

1.                     Sodium

2.                   Calcium

3.                 Potassium

2.   Name the elements presents in the following compounds   

1.                     Zinc sulphide
2.                   Sodium oxide.

PRESIDENT’S OFFICE, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

SECONDARY EXAMINATION SERIES,

MID TERM ONE – MARCH-2024

CHEMISTRY FORM TWO

TIME: 2:30 HRS

INSTRUCTIONS 

1.   Thus paper consists of section A, B and C with total of  ten (10) questions
2.   Answer all questions
3.   All writing must be in blue or Black in except drawing which must be in pencil
4.   Section A and C carry fifteen (15) marks
5.   Cellular phones and any unauthorized material are not allowed in assessment room

SECTION A (15 Marks)

Answer all questions in this section

1.                     For each of the following items (i-x).Choose the correct answer from given alternatives and writer its letter besides the item number in the box provided. 

1.                 What scientific procedure follows after data interpretation

1.              Observation
2.              Hypothesis
3.              Conclusion
4.              Experimentation

2.               The teacher was demonstrating experiment by dissolving Sodium Chloride in water until the solute was not dissolving anymore. What solution was forms at the end?

1.              Saturated
2.              Unsaturated
3.              Super saturated
4.              Suspension

3.            A large percentage of air is composed of

1.              Nitrogen
2.              Nobel bas
3.              Carbon dioxide
4.              Oxygen

4.             How do chemist refer mixture of water and milk

1.              Emulsion
2.              Suspension
3.              Misable solution
4.              Immisable solution

5.               We boil drinking water in order to:

1.              Remove oxygen
2.              Remove impulses
3.              Make it tasteless
4.              To kill micro-organisms

6.             The best way of prevent rusting of fragile instrument like camera is

1.              By using silica gel
2.              By using ethanol
3.              By galvanization
4.              By using oil

7.          The net charge inside nucleus of an atom is contributed by

1.              Protons
2.              Neutrons
3.              Electrons
4.              All nucleus

8.        Why is oxygen a unique component of air?

1.              Support combustion
2.              It is diatomic gas
3.              It forms the largest part of the air
4.              It has large density

9.             Which condition is necessary for the nails to rust?

1.              Oxygen and moisture
2.              Carbon and oxygen
3.              Carbon dioxide and oxygen
4.              Oxygen and nitrogen

2.                     Match each item in LIST  A with corresponding answer in list B and write letter of correct answer besides the item number

SECTION B – 85 marks

3.            (a) A laboratory technician instructed form two student to dissolve sodium chloride in distilled water. Give two reasons to state whether a mixture or compound was formed.

(b) Which method can be used useful in separating each the following components?

1.        Pure water from tea
2.      Oil from mixture of oil and water
3.   Ethanol from mixture of water and ethanol
4.    Salt from sea water

(c) Which change of state of matter is applied in the following process?

1.        Metallurgy
2.      Drying  materials

4.            (a)Identify type of changes involve in each of the following processes either physical or chemical

1.        Respiration
2.      Sublimation
3.   Combustion
4.    Distillation

           (b) Write the chemical symbols of the following 

1.        Potassium
2.      Sodium
3.   Mercury
4.    Gold

 (c) Give examples of apparatus made up of;

1.        Porcelain
2.      Glass material

5.            (a) Madam Jenipher was preparing Mandazi on a frying pan. Accidentally the pan toppled and huge fire spread on the kitchen floor.

1.        Which fire extinguisher  would be suitable for putting off the fire
2.      Why water is not suitable to put off the fire?

(b) Give reason to support each of the following

1.        Commodities like handbags and camera for sale are packed with silica gel
2.      When iron sheet is exposed to wet and air for longtime they turn to reddish brown color.
3.   If clothes worn by your friend catch fire, cover them with a fire blanket.

6.            Mr Mwageni decided to prepare gas M in the Laboratory. He used Hydrogen peroxide as one of the reagent to prepare the gas.

1.                Identify gas M
2.                Mention all apparatus used to prepare gas M
3.                Write word equation for preparation of Gas M
4.                state uses of gas M

7.               (a) The chemistry teacher wanted to label container in laboratory with correct warning sign. Help him label the following containers

1.       Rat poison
2.       Methylated spirit
3.       Hydrogen peroxide
4.          Concentrated Suphuric acid
5.          Cooking gas

            (b) Outline the first aid procedures to a person who has fainted  

8.      (a) Define the following

1.     water
2.  water cycle

(b) List four importance processes involved in circulation of water

(c) Identify two commercial use of water

9.   (a) Name two reagents used to prepare Hydrogen gas in Laboratory

(b) Write word equation for reaction above 

(c) Describe chemical test for hydrogen

(d) Explain why hydrogen is not used in balloons nowadays

(e) Give two uses of hydrogen 

10.           (a) What is a flame

(b) Differentiate between the two types of flames 

(c) What factors do you consider when choosing heat source in the laboratory?

PRESIDENT OFFICE REGIONAL ADMNISTRATION

AND LOCAL GOVERNMENT

SECONDARY EXAMINATION SERIES 

COMPETENCE BASED ASSEMENT

CHEMISTRY FORM TWO

TERMINAL EXAMS-MAY– 2023 

033

Time: 2:30 Hours

INSTRUCTIONS

1. This paper consists of sections A, B and C with a total of ten (10) questions.
2. Answer all questions 
3. Section A and C carry fifteen (15) marks each and Section B carry seventy (70) marks.
4. All writing must be in blue or black ink except drawing which must be in pencil.
5. Cellular phones and any unauthorized materials are not allowed in the assessment room.

SECTION A

1. For each of items (i) – (x) choose the correct answer from among the given alternatives and write its letter in box provided.

(i) What is the best way of preparing hydrogen gas in the laboratory?

1. By reacting strong metals and dilute acids.
2. By reacting metals and acids.
3. By reacting moderate metals and concentrated acids.
4. By reacting moderate metals and dilute acids. 
5. By reacting strong metals and strong acids.

(ii)Consider the following reagents:

1. H₂O₂
2. H₂O
3. MnO₄
4. .MnO₂

Which reagents are involved in the preparation of oxygen gas in the laboratory?

1. I and 2
2. 3 and 4
3. CI and 3
4. 2 and 3
5. I and 4

(iii)A good fuel is the one which has

1. high speed of continuous energy supply.
2. high energy value supplied.
3. low carbon dioxide supplied.
4. high carbon dioxide production.
5. high content of non-combustible material.

(iv) Which of the following pairs constitute the best methods for treating and purifying water?

1. Chlorination and aeration
2. Chlorination and decantation
3. Chlorination and filtration
4. Chlorination and sedimentation
5. Chlorination and distillation

(v)  A certain liquid dissolves copper (Il) sulphate to form a blue solution. This liquid is likely to be:

1.  Hydrochloric acid
2. Liquid oxygen
3. Nitric acid
4. Water
5. Lime water

(vi)  Isotopes are atoms of the same element that have different:

1. Atomic number
2. Electron arrangement
3. Mass number
4. Protons
5. Neutrons

(vii) An important property of oxygen which distinguishes it from other gases is that it:

1. Burns and supports combustion
2. Burns but does not support combustion 
3. Neither burns nor supports combustion
4. Supports combustion but does not burn
5. Reacts with metals and Non-Metals

(viii) Which of the following electronic configurations are of metals?

A. 2:8:1 and 2:5

B. 2:8:2 and 2:6

C. 2:8:3 and 2:8:8:7

D. 2:8:6 and 2:8:8:7

E. 2:8 and 2:8:7

(ix) When a burning fuel produces blue colour it means there is:

1. adequate supply of oxygen with production of soot
2. inadequate supply of oxygen with production of more heat.
3. inadequate supply of oxygen with production of soot. 
4. adequate supply of oxygen with production of more heat.
5. Insufficient fuel

(x) The process of coating iron or steel with zinc is known as:

1. zinc painting.
2. alloying.
3. tin plating.
4.  galvanization.
5. Painting.

2. Match the description of a gas in list A with corresponding gas in List B and write the answer in the space provided.

SECTION B. 70 MARKS- ANSWER ALL QUESTIONS IN THIS SECTION

3. (a) Define the following terms as used in chemistry.

1. Atom                                                                                       
2. Atomic number                                                                        
3. Mass number                                                                                     
4. Radicals                                                                                   
5. Isotopes                                                                                   

(b) The table below shows the relative atomic masses and the percentage abundance of the   isotopes L₁ and L₂ of element L. 

          Calculate the relative atomic mass of element L.    

4.(a)   The grid given below represents part of the periodic table. Study it and answer the questions that follow. (The letters do not represents the actual symbol of the elements) 

1. What name is given to the group of elements to which C and F belong?               
2. Compare the atomic radius of element C and F. explain                                      
3. Which letter represents the element that is the least reactive?                             
4. What type of bond is formed when B and E react?  Explain                                   
5. Write the formula of the compound formed when element D and oxygen gas react.          
6. On the grid, indicate with a tick the position of element G which is in the third period of the periodic table and forms G^3- ions                                                          

(b) The table below gives the number of electrons, protons and neutrons in substances X, Y and Z. 

Study it and answer the questions that follow.    

(i) Which element represents and Ion

(ii) Which of the substances are isotopes? Give a reason.

5.(a) An organic compound P consist of 52.2% of carbon, 13% of hydrogen and 34.8% of oxygen. The vapour density of P is 23. Calculate the molecular formula of the compound P and write possible isomer(s) from the molecular formula determined.

 (b) Hydrogen peroxide breaks down slowly to form water and oxygen; the reaction can be speed up by using a catalyst.

1. How does the catalyst speed up the rate of reaction?
2. Name a possible catalyst that can be used to speed up the reaction.
3. Show that the catalyst always remains unchanged at the end of the reaction.

6.(a) Briefly explain the following

(i) Nitrogen gas is a necessary component of atmosphere

(ii) Nitrogen I Oxide is also called a Laughing gas

(iii) When carbon dioxide is passed through lime water, it turns milky

(iv) Things made of iron rust faster in coastal towns like Dar es salaam than in areas like Dodoma.

(v) Laboratory should have large windows

7.Using a well labelled diagram, explain how simple distillation can be used to separate a mixture of water and alcohol.

8. (a)What properties of hydrogen gas that made it to be used in the following?

i. As a fuel 

ii. To fill weather balloons 

iii. Manufacture of hydrochloric acid

iv. Manufacture of margarine 

(b) Environmental pollution in most of rural areas in Tanzania is caused by using charcoal and firewood as a fuel. What will be the two alternative source of energy, they supposed to use for environmental conservation? (give reason for each)

(c) Why fossil fuels are referred to as non-renewable energy resources? (Give two reasons)

9. (a) (i) A table salt is a common name for the compound with the formula NaCl.

Write the systematic name for the table salt

(ii) Briefly describe why molecular formula better preferred than empirical formula is

(b) A compound consists of 27% sodium, 16.5% nitrogen and 56.5% oxygen by mass. If its molecular mass is 85g, find:

(i) Its empirical formula 

(ii) Molecular formula 

10. (a) Most of laboratory apparatuses are made up of glass materials. Why? (Give three reasons)

(b) Briefly explain how to handle chemicals having the following warning signs.

(i) Flammable

(ii) Corrosive

(c) Why luminous flame produces soot?

PRESIDENT OFFICE REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

SECONDARY EXAMINATION SERIES 

COMPETENCE BASED ASSESSMENT

032 CHEMISTRY FORM TWO 

MID-TERM EXAMS MARCH – 2023 

Time: 2:30 Hours

INSTRUCTIONS

1. This paper consists of sections A and B with a total of ten (10) questions.
2. Answer all questions in the spaces provided
3. All writing must be in black or blue ink except diagrams which must be in pencil
4. Cellular phones and any unauthorized materials are not allowed in the examination room.
5. The following atomic masses may be used: H= 1, N= 14, O= 16, S=32, Ca=40.

SECTION A

1.  For each of the items (i) – (x) Choose the correct answer from among the given alternatives and write its letter on answer booklet

1. Factors in an experiment that can be manipulated to get desired results are called

1. Controlled variable
2. Manipulated variable
3. Dependent variable
4. Independent variable

2. One of the following apparatus is used to measure fixed volume of a liquid

1. Pipette
2. Burette
3. Measuring cylinder
4. Beaker

3. A student who gets burnt accidentally in chemistry laboratory; would be given one of the following first Aid

1. Antibiotic solution
2. Nitric acid
3. Petroleum Jelly
4. Potassium Permanganate

4. What is the name given to the constant temperature of a substance changing its state from liquid to solid

1. Melting point
2. Boiling point
3. Freezing point
4. Sublimation point

5. Point out the odd man out in the following group of elements

1. Zinc, sulphur sodium
2. Copper, sodium, iron
3. Aluminum, sodium, zinc
4. Sodium, zinc, copper

6. Jenipher wanted to obtain pure water from dirt water, which process did she use;

1. Evaporation and sublimation
2. Evaporation and crystallization
3. Evaporation and condensation
4. Evaporation and decantation

7. The choice of source of heat depend on the

1. Color of the flame
2. Quantity of heat produced
3. Substance to be bummed in air
4. Types and shape of flame

8. When Anna was preparing food, the frying pan got fire. What type of fire extinguishers would you advice her to use.

1. Carbon dioxide
2. Fire blanket
3. Sand
4. Water

9. An important property of Oxygen that distinguishes it from other gases is that;

1. Burns and Support combustion
2. Bum but does not support combustion
3. Neither burns or support combustions
4. Support combustion

10. The chemical used to test for the presence of water in a substance is

1. Cobalt II Oxide
2. Cobalt III Oxide
3. Cobalt Chloride
4. Copper II Chloride

2. (a)Match the property in List A with the term in List B by writing the letter of correct letter on space provided

(b)Fill the blank below with correct answer

1. Water is Oxide of __________ and ________
2. The catalyst used in preparation of Oxygen is ___________
3. Why is hydrogen used in filling balloons _____________
4. The reagents used to prepare hydrogen in laboratory are __________ and _____
5. The process of circulation of water is atmosphere is called ___

SECTION B

3. Care “P” has the following properties; it is lightly flammable readily combiner with other elements readily reacts with other chemical substance and is a strong reducing agent.

1. Name the gas “P”
2. What is the method used to collect gas “P” in the laboratory? Give reason
3. Give 4 uses of gas “P”

4. (a)Write the names of chemical substances used to test the presence of water

(i) _______ and (ii) _____

(b)Write the examples in which water occur are

1. Solid
2. gas

(c)Name chemical substance used in laboratory preparation of hydrogen gas.

5. (a)Write a word chemical equation to shoo the deco portion of hydrogen peroxide in the presence of manganese (iv)Oxide

(b)Why Oxygen gas is collected over water?

(c)Respiration and burning are similar process in some ways and difference process in other ways. Give two differences between them

6. Consider the diagram below USED to prepare hydrogen gas and then answer the questions that follow.

Label parts

1. A _________
2. B ___________
3. C ____________
4. D _____________
5. F. ___________

7. (a)What is a fuel

(b)Describe six qualities of a good fuel

8. (a)State two importance of studying chemistry

(b)Mention two items used in each of the following categories that are made though application of chemistry

1. Agriculture
2. Pharmaceuticals
3. Household items
4. Food and beverage
5. Transport

9. (a)State three components of fire Triangle

(b)Mention three conditions for rusting

(c)Rusting occur rapidly in Dar – es – Salaam than in Dodoma Elaborate

10. (a)What is a flame

(b) Write five differences between luminous and non-Luminous flame

THE PRESIDENT’S OFFICE MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

COMPETENCY BASED SECONDARY EXAMINATION SERIES

                                                            CHEMISTRY   FORM TWO

TIME: 2 HOURS                                                                                                      NOVEMBER 2022

INSTRUCTIONS

1. This paper Consist of sections A, B and C with total of 10 questions 

2. Answer all questions in both sections 

3. All writings should be in blue/black ink 

4. All diagrams should be drawn in pencil 

5. Write your assessment number at the top right corner 

SECTION A (15 Marks)

1. For each of the items (i)-(x), choose the correct answer from among the given alternative and write its letter in the box provide.

 (i)   At room temperature in which substances are particles furthest apart?

A.   Water

B.    Sodium chloride

C.    Magnesium

D.   Hydrogen

E.    Hydrochloric acid

(ii)In the molecules CH4, HCI, and H20 which atoms use all of their outer shell electrons in bonding? 

A. C and C! 

B. C and H 

C. a and H

D. H and O 

E. C and O

(iii)  In the laboratory one spoon of sugar was mixed with 200cm³ of water in a beaker to form .mixture

A.   Suspension

B.    Homogeneous

C.    Emulsion

D.   Miscible

E.    Heterogeneous

(iv)   The part of the Bunsen burner which controls the amount of air to support burning of the gas is

A. Jet

B.  Air hole

C.  Chimney 

D. Collar

E. Gas inlet

(v)        A certain mixture contained 280cm³ of alcohol and 300cm³ of water in the round bottomed flask, a form I student separated this mixture by fractional distillation process. Why?

A.   The two components have approximately the same volume

B.    The volume of water is less than the volume of alcohol

C.    The two component differ in boiling point

D.   The two component differ in volume

E.    Both are liquids at room temperature

(vi)     Which change of matter occurs when water is kept at (zero) O^OC?

A.   Water and vapour

B.    Liquid to gas

C.    Liquid to solid

D.   Water to steam

E.    Water to ice

 (vii)   A non - luminous flame is suitable for heating because

A.   It is very noisy

B.    It is very hot

C.    It has no soot

D.   It is very large

E.    It produce light

(viii) Calcium ion and calcium atom both have the same

A.   Size

B.    Physical properties

C.    Number of protons

D.   Electronic configuration

E.    Charge

(ix)     Class B fire can be extinguished by using each of the following

A.   Oxygen and nitrogen

B.    Carbondioxide and sand

C.    Carbondioxide and water

D.   Sand and water

E.    Hydrogen and neon

(x)..........................has the highest percentage abundance in air

A.   Nitrogen

B.    Oxygen

C.    Noble gas

D.   Water vapour

E.    Carbondioxide

2. Choose a word(s) from LIST B which matches the statement in LIST A and write its letter in the table provided below.

SECTION B: (70 MARKS)

Answer all questions in the space provided for each question

3. (a) There is a room at Mtakuja secondary school, having only the following features

• Large windows
•  One door open inwards
• Slippery floor
•  No water supply

Does the room qualify to be used as a chemistry laboratory? Give three reasons

(b) Calculate the molar mass of

(i) A1₂0₃

(ii) Ca(OH)₂

(iii) C0₂

4.(a) 

 (b)Element T has 19 electrons and mass number of 39, what is the; (i) Atomic number of element T?

(ii)  Number of neutrons of element T?.

(iii) Number of protons of element T?

(iv)  Write the nuclide notation of element T.....

(v)   Give the name of element T....

(c) ²⁰⁴J ²⁰⁶K ²⁰⁷L and ^AM are isotopes of element Q whose abundances are 2%, 24%, 22% and 52% respectively. Calculate the mass number A of an isotope M, given that the relative atomic mass of element Q is 207

(d)A form Il student from Pwani secondary school conducted an experiment as follows:He boiled a hydrated copper (Il) sulphate blue solution in a crucible until all water evaporated. Explain the changes observed during experiment.

5.  (a) Mr Juma was passing through in the laboratory and found a beaker on top of a table. He picked up the beaker with his bare hand, accidentally the beaker cut his finger since it was broken. Suggest four possible items of the first aid and their function to help Mr Juma.

 (b) Give any three reasons to support that sodium chloride is a compound but Air is a mixture of gases.

6.  (a) Write the name of the following compounds

(i) (NH₄)₂C0₃

(ii) N₂0₄ 

 (iii) FeC13

(b) Calculate the oxidation state of the underlined element in the given compound 

(i) KC10₃

(ii) PbO₂

(c) Write the chemical formula for the following compound

(i)    Calcium nitrate

(ii)    Zinc hydroxide

 (iii)   Copper (I) oxide

7.  (a) The diagram below shows the position of some elements in the periodic table. Study it and answer the questions below Note: The letters given are not the actual symbols of elements

(i) Identify the most reactive non-metal......................................................................

(ii) Give the formula of only one stable ion with an electronic configuration of 2:8

(iii) Which letter represents an element with a positively charged ion............

(iv) Explain the trends of atomic radii from X to U...........................

(v)  Identify elements represented by letters; W, Z, X and Y

1. W................................
2. Z....................................
3. X.....................................
4. Y.......................................

(vi) State group and period of element X

 (vii)  Explain why element V is stored under paraffin or Kerosine?  

(b) A large number of Tanzania society are using firewood and charcoal as a source of fuel for domestic uses because it is very cheap and readily available but it has a negative effect in the environment. Assess the effect of such fuel in the environment

(c) (i) Coal and Petroleum are said to be a natural source of fuel. Explain why they are termed as non -renewable source of energy?

 (ii) State the law of conservation of energy

 (iii)   Petrol acid kerosene are liquid fuel. When burn they release energy, identify what type of energy they produce? (Give any two points)

8.  (a) Organic compound M composed of 52.2% of carbon, 13% of hydrogen and the rest is oxygen. If the vapour density of compound M is 23 (i) Find the percentage of oxygen in a compound M

(ii)Calculate the empirical formula of compound M

 (iii)                      Calculate the molecular formula of compound M

9. (a) Draw a well labelled diagram of laboratory preparation of a colorless gas which support combustion at room temperature (without heating)

(b) State the property that support hydrogen gas to be used in

(i)  Production of margarine

 (ii) Making oxy — hydrogen flame.

(iii) Production of water gas

 (iv)  Filling of weather balloons......................

SECTION C: (15 MARKS)

10. (a) Four experiment were conducted using chemical A, B, C and D on different materials, the results were given as indicated below. You are required to write the correct terminology which suits each of the results given and draw the chemical warning signs which goes with it

(i)    When chemical A was poured on the wool it completely damage the surface of the wood

(ii)When chemical B was poured on the small fire, it found burst and turning a bigger fire

(iii) When chemical C was brought near the skin of some one, he started to complain that his skin was itching

(iv)  When chemical D was exposed on air sudden blust accompanied with light occurred.

(b) List down any two importance of changing states of matter in our daily life

PRESIDENT’S OFFICE

REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

FORM TWO EXAMINATION – SEPTEMBER 2022

032     CHEMISTRY

TIME: 2:30 HOURS

INSTRUCTIONS

1. This paper consists of sections A and B with a total of TEN (10) questions
2. Answer all questions in the space provided.
3. All writing must be in black or blue ink except for diagrams which must be in pencil
4. Cellular phones and any unauthorized materials are not allowed in the examination room
5. Write your Examination Number on every page of your answer booklet(s)
6. The following constants may be used

Zn= 65, X =32, O=16

SECTION A (15 Marks)

Answer all questions in this section

1. For each of the items (i) - (x), choose the correct answer from among the given alternatives and write its letter beside the item number in the bracket provided.

1.        When burning a fuel produces  blue color it means there is

1. Adequate supply of oxygen with production of soot
2. In adequate supply of oxygen with production of soot
3. Adequate supply of oxygen with production of less heat
4. Adequate supply of oxygen with production of more heat ( )

2.       Which of the following is an agricultural chemical products made by the application of chemistry?

1. Drugs B. Pesticides  C. Clothes  D. Cement ( )

3.    Which of the following is NOT among the composition of air?

1. Noble gases B. Hydrogen  C. Carbon dioxide    D. Nitrogen ( ) 

4.   Which one of the following sets of laboratory apparatus are used for measuring volume of liquids

1. Conical flask, measuring cylinder and test tube
2. Burette, pipette and measuring cylinder   ( )
3. Volumetric flask, water though and burette
4. Gas jar, measuring cylinder and pipette

5.      The following are the characteristic of ionic compound

1. They are easily vaporized
2. They are easily dissolved in organic solvent
3. Conduct electricity when in solution or molten
4. Usually exist as liquid or gas at room temperature

6.   Which of the following is a symbol of silver ion

1. Ag  B. S  C. Ag+  D. Si   ( )

7.  What is proton, electron and atomic number AI    ( )

1. 13,13,13  B. 13,11,13  C. 13,12,13  D. 13,13,11

8. Which state is involved when drying wet clothes?

1. Liquid to solid B. Gas to liquid C. Liquid to gas  D. Solid to gas( )

9.    The components of fire triangle are ;

1. Oxygen, fuel and heat  C. Oxygen, heat and hydrogen ( )
2. Oxygen, nitrogen and heat D. Oxygen, carbon dioxide and fuel

10.      Which group and period does the element with 14 electrons belong?

1. Group II and period 3  C. Group III and period 3 ( )
2. Group IV and period 3  D. Group II and period 4

2. Match the descriptions in List A with the corresponding in List B by writing the letter of the correct response beside the item number in the answer booklet provided

Answers

SECTION B (70 Marks)

Answer all questions in this section

3(a) Fill the blanks 

1. The techniques used to separate serum from blood samples is called _________________________
2. The insoluble substances remain in a filter paper during filtration are termed as ___________________________
3. Boiling points of substance reflect the strength of __________________
4. The sub atomic particles of an atom are ____________________ and _____________________
5. Solar energy is example of _______________________resources

3. (b) Suggest the best method of separating the following mixture

1. Alcohol and water  _______________________________________________________________________________________________________________________________________________________________________________________
2. Sodium chloride and water _______________________________________________________________________________________________________________________________________________________________________________________
3. Green solution from leaves   _______________________________________________________________________________________________________________________________________________________________________________________
4. Sand from rice  _______________________________________________________________________________________________________________________________________________________________________________________

5. Iron fillings and powder calcium carbonate  _______________________________________________________________________________________________________________________________________________________________________________________

4. (a) Complete the following table

(b) With one example explain each of the following

1. Alkali earth metals __________________________________________________________________________________________________________________________
2. Metalloids  __________________________________________________________________________________________________________________________
3. Transition metals  __________________________________________________________________________________________________________________________
4. Why are noble gases stable? __________________________________________________________________________________________________________________________
5. Why covalent compound do not conduct electricity  __________________________________________________________________________________________________________________________

5. (a) What is destructive distillation

__________________________________________________________________________________________________________________________________________

(b) Mention five (5) procedures of preparing charcoal from the method mentioned in 

      5(a) above 

1. ________________________________________________________
2. ________________________________________________________
3. ________________________________________________________
4. ________________________________________________________
5. ________________________________________________________

  (c) Mention four (4) steps of lightning a Bunsen burner

1. ________________________________________________________
2. ________________________________________________________
3. ________________________________________________________
4. ________________________________________________________
5. ________________________________________________________

6. An atom of element X having atomic number 11 combines with an atom of element Z having atomic number 17 to form a compound
   1. Write the formula of the compound and state the type of bond formed in the compound

2. Give four properties of compound in 6(a)

1. ____________________________________
2. ____________________________________
3. ____________________________________
4. ____________________________________
5. ____________________________________

7. (a) Write the chemical symbols for beryllium, boron, neon, nitrogen and phosphorus

1. ____________________________________
2. ____________________________________
3. ____________________________________
4. ____________________________________
5. ____________________________________

(b) You are provided with a compound composed of 40.5% zinc. 19.6% sulphur and 

     39.9% oxygen. Calculate the molecular and empirical formula. If it’s molecular 

     mass is 161

8. (a) By giving one reason, explain the following facts

1. During laboratory preparation of oxygen gas, little manganese dioxide is added to hydrogen peroxide.

__________________________________________________________________________________________________________________________

2. Fish can obtain oxygen for respiration although spend their life in water

_________________________________________________________________________________________________________________________ 

3. Oxygen gas can be used for welding activities although it does not burn

__________________________________________________________________________________________________________________________

      (b) Which property enables the use of hydrogen gas in 

1. Fueling __________________________________________________
2. Manufacturing of margarine _________________________________

3. Give two domestic uses of oxygen gas

1. ________________________________
2. ________________________________

9. (a) Define the following terms

1. Water treatment __________________________________________________ ________________________________________________________________
2.            Water purification  _____________________________________________ ________________________________________________________________

(b) List down four (4) economic uses of water 

1. ____________________________________
2. ____________________________________
3. ____________________________________
4. ____________________________________

(c) What are the importance of water treatment and purification? Give two (2) reasons 

__________________________________________________________________________________________________________________________________________

SECTION C (15 Marks)

10. Briefly explain five methods used to prevent rusting and give example for each

THE PRESIDENT’S OFFICE

MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

COMPETENCY BASED SECONDARY EXAMINATION SERIES

CHEMISTRY TERMINAL EXAMINATION

FORM TWO-2022

Time: 2:30Hours

Instructions.

1. This paper consists of section A, and B with a total of 10 questions
2. Answer all questions in spaces provided.
3. Section A carries 20 marks, section B 80 marks.
4. All answers should be written in the spaces provided.
5. All communication devices, calculators and any unauthorized material are not allowed in examination room.
6. Write your number on every page of your answer booklet.
7. The following atomic masses may be used: H=1, N=14, O=16, S=32

 SECTION A (20 Marks)

 Answer All questions in this section.

1. For each of the items (i)-(x), choose the correct answer from the alternatives given.

1. The valency of an element with atomic number 10 is;

1. 2      B. 3       C. 0    D. 1 

2. How many protons, neutrons and electrons are there in an atom represented by the symbol

Protons   Neutrons  Electrons 

1. 39  19  20
2. 19  39  20
3. 20  19  20
4. 19  20  19

3. Separation of a mixture by fraction all distillation is possible if the mixture constituents differ in their;

1. Boiling points   B. Melting points   C. Freezing points    D. Vapourizing points

4. When element T of Group 1 combines with element X of Group VI, the formula of the compound formed is;

1. T₂X    B. X₂T     C. TX₂     D. XT₄ 

5. Saturated solution is one which;

1. Contains more solute undissolved  at a given temperature
2. Has a large amount of solvent at a given temperature
3. Contains a little solute at a given temperature
4. Will take no more of solute at a given temperature

6. The most abundant element on the earth is;

1. Carbon     B. Iron    C. Nitrogen    D. Oxygen

7. Petrol is an example of;

1. Ionic substance   C. Flammable substance 
2. Irritating substance  D. Corrosive substance 

8. Domestic utensils made of iron undergo rusting when exposed to;

A.  Air and fire   B. Air and oil   C. Air and water   D. Water and oil 

9. The chloride iron (Cl^-) differs from chlorine atom because chloride ion has;

A.  Loss electrons    B. Less protons   C. More electrons   D. More protons 

              x.   Which of the following chemical species have the same number of electrons? 

                    A. Cl, Be, He and O^2-       B. K⁺, Ca²⁺, Cl^- and Ar  

                    C. Na⁺, Mg²⁺, Al³⁺ and Li   D. O^2-, F^-, S^2- and Cl^- 

SECTION B: 20 MARKS

2. You are provided with two lists A and B. Choose a words from list B which matches the statement or phrase in List A and write its letter in the table provided below;

(b) 

SECTION B: 80 MARKS

3. (a) What do you understand by the following terms?

1. First Aid ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
2. First Aid Kit ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(b) Name four components which can be found in First Aid Kit; 

1. …………………………………………………………………………………………………………
2. …………………………………………………………………………………………………………
3. …………………………………………………………………………………………………………
4. …………………………………………………………………………………………………………

(c) Why is it important to provide First Aid to an injured person? Give four reasons;

1. …………………………………………………………………………………………………………
2. …………………………………………………………………………………………………………
3. …………………………………………………………………………………………………………
4. …………………………………………………………………………………………………………

4. (a) For each of the following classes of fire, state the burning material(s);

1. Class A fire ……………………………………………………………………………………………
2. Class B fire ……………………………………………………………………………………………
3. Class C fire ……………………………………………………………………………………………

(b) Fire can be prevented by; 

1. …………………………………………………………………………………………………………
2. …………………………………………………………………………………………………………
3. …………………………………………………………………………………………………………
4. …………………………………………………………………………………………………………

5. (a) By giving one example, define the following terms;

1. Suspension ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
2. Chromatography ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(b) Briefly explain the following ways of preventing rusting. 

1. Electroplating ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
2. Galvanizing ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(c) Write the chemical symbols for the following elements; 

1. Silver ………………………..
2. Iron ………………………….
3. Aluminium …………………….

6. (a) If a mixture of manganese (IV) oxide, MnO₂ with potassium chlorate, KClO₃ is treated, which of

     the two compounds will produce oxygen? 

1. …………………………………………………………………………………………………
2. Why? ………………………………………………………………………………………….

(b) Calculate the oxidation number of the underlined elements;

1. NH₄⁺
2. SO₄^2-
3. CUSO₄
4. FeCl₂

7. (a) List down four assumptions of the Dalton’s Atomic Theory;

1. ……………………………………………………………………………………………………
2. …………………………………………………………………………………………………
3. …………………………………………………………………………………………………
4. …………………………………………………………………………………………………

(b) Write a chemical formula for each of the following compounds;

1. Water …………………………………………………………..
2. Potassium chloride ………………………………………………
3. Magnesium oxide ………………………………………………….
4. Calcium hydroxide ……………………………………………….

(c) (i) What do you understand by the term “Chemical warning signs”? ……………………………………………………………………………………………………………

  (ii) Draw the chemical warning sign that represents; 

8. Study the periodic table below;

 I                                                                                        VIII

                                    II         III         IV         V         VI        VII

Use the letters shown in the periodic table above to indicate; 

1. Elements with zero valency …………………………
2. The lightest atom. …………………………………….
3. The alkaline earth match. ……………………………………
4. An element with electronic configuration of 2: 8: 1. …………………………..
5. Give the names of elements represented by the mentioned letters A, B, C and D. ……………………………………………………………………………………
6. Give the name of J as an element. ………………………………………………….
7. Write the electronic configuration of J. …………………………………………….
8. What type of a bond can be formed when element J combined with element H? ……………………………………………………………………
9. What type of a bond can be formed when an element H combines with an element H …………………………………………………………………

9. (a) What is air? ………………………………………………………………………………………………………………………………………………………………………………………………………………………….

(b) Mention the composition of air with their percentage composition; 

(c) Give four reasons why air is a mixture. 

1.  ……………………………………………………………………………………………………
2. …………………………………………………………………………………………………
3. …………………………………………………………………………………………………

                 iv       …………………………………………………………………………………………………

10. (a) Give the method used to separate the following mixtures;

1. Kerosene and water …………………………………………………………………………………
2. Alcohol (ethanol) and water ………………………………………………………………………..
3. Iron fillings and sand ……………………………………………………………………………….
4. Iodine crystals and table salt ……………………………………………………………………….

(b) Water is a chemical compound? Give four reasons to support this fact. 

1. ………………………………………………………………………………………………………
2. ……………………………………………………………………………………………………….
3. ……………………………………………………………………………………………………….
4. ………………………………………………………………………………………………………

THE PRESIDENT’S OFFICE

MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

COMPETENCY BASED SECONDARY EXAMINATION SERIES

CHEMISTRY MID TERM EXAMINATION

FORM TWO- MARCH/APRIL-2022

Time: 2:30Hours

Instructions.

1.  This paper consists of section A, and B with a total of 10 questions
2. Answer all questions in spaces provided.
3. Section A carries 20 marks, section B 80 marks.
4. All answers should be written in the spaces provided.
5. All communication devices, calculators and any unauthorized material are not allowed in examination room.
6. Write your number on every page of your answer booklet.
7. The following atomic masses may be used: H=1, N=14, O=16, S=32

 SECTION A (20 Marks)

 Answer All questions in this section.

1. Write the letter of the best answer in each of the following multiple choice questions. Use the table below.

1. What best knowledge can be used by industrialists to manufacture chemicals

1. Methods of separating mixtures
2. Debate on drug abuse
3. Campaigns on elections
4. Labeling apparatus for experiments

2. How students can protects him against injuries and deaths in a school laboratory?

1. To walk very slowly along the corridors of a laboratory
2. To study ways of offering first AID
3. To observe laboratory rules
4. To study uses of products from manufactures

3. Which one of the following pair of chemicals is used to swab clean fresh cuts and wounds?

1. Methylated spirit and iodine tincture
2. Petroleum jelly and copper sulphate
3. Milk of magnesia and sodium chloride
4. Ethanoic acid and calcium hydroxide

4. What is the common use of the following hardware laboratory equipments, a pair of tongs, forceps, clamp and stand, sugar tongs

1. To determine mass of the chemicals
2. To burn chemicals
3. To pick solid chemicals
4. To hold objects

5. Which is the appropriate warning sign to be pasted on a container that has a chemical which is a source of oxygen

1. Flammable
2. Explosive
3. Oxidizing
4. Corrosive

6. Which set of apparatus seems to belong in a group of glassware

1. Thermometer, crucible and lid, white tile clamp and stand
2. Volumetric flask, reagent bottle, beehive shelf, pipe clay triangle
3. Separating funnel, burette, pipette, conical flask
4. Beakers, cork borer, Bunsen burner, glass rod

7. What is the name of the constant temperature of a substance changing its state from liquid to solid?

1. Melting point
2. Boiling point
3. Freezing point
4. Sublimation point

8. Which process changes a gas directly to solid without the liquid state?

1. Condensation
2. Sublimation
3. Solidification
4. Non of the above

9. Which of the following process is not a chemical change?

1. Soaring of  milk
2. Burning of paper
3. Decomposition of a compound by heating
4. Separating mixtures

10. Substances which are poor conductors of heat and electricity. What is best idea one can give about the above statement?

1. They are metals
2. They are non metals
3. They are elements
4. They are mixtures

2. (a) Match the following items by writing the letter against numbers for the best matches. Use the table below

       (b) Fill in the following blanks spaces to make meaningful statement

1. …………………………………… is used to separate liquids mixtures of different densities which do not mix. The liquid which comes out first is found at the …………………………………… of the funnel
2. A reagent bottle is used to store chemical ……………………………… and the label on the side of the bottle carries the ……………………….of the chemical in the bottle
3. Hydrogen gas is a ………………………………… causing substance suck substances are called ……………………………………
4. …………………………………… is a small special box which contains items used to offer …………………………………………….
5. Detergents are examples of …………………………………pollutants. They interfere with …………………………….balance. B.O.D

SECTION B (80 Marks)

Answer all questions in this section.

3. List four (4) chemical properties of oxygen
4. Write three (3) common methods of preparations of oxygen in the laboratory
5. What is chemical test for oxygen gas?
6.  List any four (4) uses oxygen gas in our daily life

7. Write a word chemical equation to show the decomposition of hydrogen  peroxide in the presence of manganese (IV) oxide.
8. Why oxygen gas is collected over water?
9.  Respiration and burning are similar process in some ways and difference  process in other ways. Give two differences between them.

10. a) State any four laboratory rules

(b) Consider the diagram below and then answer the questions that follows:

Label parts 

1. A ………………………………………………………………………………………
2. B…………………………………………………………………………………………
3. C…………………………………………………………………………………………
4.  D ………………………………………………………………………………………
5.  E ……………………………………………………………………………………………..

THE PRESIDENT’S OFFICE

MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

COMPETENCY BASED SECONDARY EXAMINATION SERIES

CHEMISTRY MID TERM EXAMINATION

FORM TWO- AUG/SEPT 2021

 Time: 2:30Hours

Instructions.

1.                          This paper consists of section A, and B with a total of 10 questions
2.                          Answer all questions in spaces provided.
3.                          Section A carries 20 marks, section B 80 marks.
4.                          All answers should be written in the spaces provided.
5.                          All communication devices, calculators and any unauthorized material are not allowed in examination room.
6.                          Write your number on every page of your answer booklet.
7.                          The following atomic masses may be used: H=1, N=14, O=16, S=32

 SECTION A (20 Marks)

 Answer All questions in this section.

1.                For each of the items (i)-(x), choose the correct answer from the alternatives given.

(i) The elements which are found in group VIII of the periodic table are known as:

1.              Metals
    
2.               Noble gases
3.               Non - metals
4.              Right elements

(ii) Isotopes are atoms which have:

1.              Different mass number
2.               Different number of electrons
3.               Different number of protons
4.              The same number of neutrons

(iii) The elements which are found in group VIII of the periodic table are known as:

1.              Metals
    
2.               Noble gases
3.               Non - metals
4.              Right elements

(iv) The process used to separate a mixture of salt and water is:

1.              Evaporation
2.               Filtration
3.               Simple distillation    
4.              Sublimation

(v) Saturated solution is one which:

1.              Contains more solute undissolved at a given temperature.
2.               Will take no more of solute at a given temperature.
3.               Contains a little solute at a given temperature.
4.              Has a large amount of solvent at given temperature.

 (vi) Which of the following electronic configurations are of metals?

1.              2:8:8:1 and 2:8:8:7
2.               2:8:3 and 2:8
3.               2:8:8:1 and 2:8:3
4.              2:8:6 and 2:8:8:7

(vii) One isotope of an element has atomic number A and mass number M. How many neutrons are contained in the nucleus of its atom?

1.              M
2.               A
3.               A - M
4.              M - A

(viii) The total number of protons and neutrons in the nucleus of an atom is called:

1.              Valency number  
2.                Atomic number
3.                Molecule number    
4.               Mass number

(ix)  Oxidation may be defined as:

1.              Loss of hydrogen by a substance
2.               Gain of hydrogen by a substance
3.               Reaction in which oxygen is lost
4.              Reaction in which electrons are increased

(x) Moving across a period in the periodic table,

1.              Electro negativity decreases
2.               Electro negativity increases
3.               Metallic property increases
4.              Electro positivity increases 

2. (a)Match each item in List A with a correct response in List B by writing the letter of the correct response below the corresponding item number in the table provided.

(b) Answer the given questions by writing the correct answer in the blank spaces provided.

1. Has both metallic and non metallic properties………………………
2. A gas that can undergo sublimation………………………..
3. Name given to group seven elements which means salt producer…………………..
4. An example of renewable fuel from organic matter…………………..
5. Separation of colored substances…………………..

3. Briefly explain five characteristics to be considered when looking for a good fuel.

4.(a) During preparation of Hydrogen gas by the reaction between dilute Hydrochloric acid and Zinc granules, the granules slowly dissolve in acid to form solution X. 

(i) Name solution X .........

(ii) Write the chemical formula of X . . . . . . 

(b) How can hydrogen gas be tested?

(c) Mention four (4) chemical properties of hydrogen gas.

(d) List three (3) uses of Hydrogen gas.

5.Outline six common apparatus used in the laboratory preparation of oxygen gas using hydrogen peroxide.

(b) Outline four uses of oxygen in everyday life situation.

6.(a) Define the following terms:

(i)Valency

(ii)Oxidation state

(iii) Anion

(iv)Cation

(b) Calculate the oxidation state of the underlined elements in the following radicals:

(i) NH₄+

(ii) SO₄²⁺

(iii) CLO₃^-

(c) A compound consists of 40% carbon, 6.67% hydrogen and 53.33% oxygen. If its relative molecular mass is 60, calculate the following:

(i)Empirical formula

(ii)Molecular formula

7.(a) Define the following terms:

(i)Oxidation state 

(ii)An element .......„

(iii)A compound

(iv)Fainting 

(b)Write the chemical formula for each of the following compounds:

(i)Sodium sulphate 

(ii)Sodium chloride .. 

(iii)Calcium nitrate ......... (iv) Calcium oxide . 

8.State two chemical properties of water.

(b) Calculate the molar mass of each of the following compounds:

(ii) NaHC03                        (iii) Fe203 

9.Define the following terms:

(i)Empirical formula .........

(ii)Molecular formula .........

(b)A compound consists of 85.7% carbon and 14.3% hydrogen by mass. If its relative molecular mass is 56, calculate:

(i)Empirical formula.

(ii)Molecular formula.

10.(a) Study the following periodic table and then answer the questions that follow:

(i) Name elements named by the following letters: S, W, X, Z

(ii) Write the electronic configuration for the elements represented by the following letter.

10.(b) Study the experiment diagram below and answer the questions that follow.

(i)What happens to the copper (Il) oxide during the experiment?

(ii)What happens to the two pieces of cobalt paper? (iii) Write a word equation for the reaction.

THE PRESIDENT’S OFFICE

MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

COMPETENCY BASED SECONDARY EXAMINATION SERIES

CHEMISTRYTERMINALEXAMINATION

FORM TWO-2021

 Time: 2:30Hours

Instructions.

1.              This paper consists of section A, and B with a total of 10 questions
2.              Answer all questions in spaces provided.
3.              Section A carries 20 marks, section B 80 marks.
4.              All answers should be written in the spaces provided.
5.              All communication devices, calculators and any unauthorized material are not allowed in examination room.
6.              Write your number on every page of your answer booklet.
7.              The following atomic masses may be used: H=1, N=14, O=16, S=32

 SECTION A (20 Marks)

 Answer All questions in this section.

1. For each of the items (i)-(x), choose the correct answer from the alternatives given.

1. The valency of an element with atomic number 10 is;

1. 2      B. 3       C. 0    D. 1 

2. How many protons, neutrons and electrons are there in an atom represented by the symbol

Protons   Neutrons  Electrons 

1. 39  19  20
2. 19  39  20
3. 20  19  20
4. 19  20  19

3. Separation of a mixture by fraction all distillation is possible if the mixture constituents differ in their;

1. Boiling points   B. Melting points   C. Freezing points    D. Vapourizing points

4. When element T of Group 1 combines with element X of Group VI, the formula of the compound formed is;

1. T₂X    B. X₂T     C. TX₂     D. XT₄ 

5. Saturated solution is one which;

1. Contains more solute undissolved  at a given temperature
2. Has a large amount of solvent at a given temperature
3. Contains a little solute at a given temperature
4. Will take no more of solute at a given temperature

6. The most abundant element on the earth is;

1. Carbon     B. Iron    C. Nitrogen    D. Oxygen

7. Petrol is an example of;

1. Ionic substance   C. Flammable substance 
2. Irritating substance  D. Corrosive substance 

8. Domestic utensils made of iron undergo rusting when exposed to;

A.  Air and fire   B. Air and oil   C. Air and water   D. Water and oil 

9. The chloride iron (Cl^-) differs from chlorine atom because chloride ion has;

A.  Loss electrons    B. Less protons   C. More electrons   D. More protons 

              x.   Which of the following chemical species have the same number of electrons? 

                    A. Cl, Be, He and O^2-       B. K⁺, Ca²⁺, Cl^- and Ar  

                    C. Na⁺, Mg²⁺, Al³⁺ and Li   D. O^2-, F^-, S^2- and Cl^- 

2. (a) You are provided with two lists A and B. Choose a words from list B which matches the statement or phrase in List A and write its letter in the table provided below; 

SECTION B: 80 MARKS

3. (a) What do you understand by the following terms?

1. First Aid ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
2. First Aid Kit ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(b) Name four components which can be found in First Aid Kit; 

1. …………………………………………………………………………………………………………
2. …………………………………………………………………………………………………………
3. …………………………………………………………………………………………………………
4. …………………………………………………………………………………………………………

(c) Why is it important to provide First Aid to an injured person? Give four reasons;

1. …………………………………………………………………………………………………………
2. …………………………………………………………………………………………………………
3. …………………………………………………………………………………………………………
4. …………………………………………………………………………………………………………

4. (a) For each of the following classes of fire, state the burning material(s);

1. Class A fire ……………………………………………………………………………………………
2. Class B fire ……………………………………………………………………………………………
3. Class C fire ……………………………………………………………………………………………

(b) Fire can be prevented by; 

1. …………………………………………………………………………………………………………
2. …………………………………………………………………………………………………………
3. …………………………………………………………………………………………………………
4. …………………………………………………………………………………………………………

5. (a) By giving one example, define the following terms;

1. Suspension ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
2. Chromatography ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(b) Briefly explain the following ways of preventing rusting. 

1. Electroplating ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………
2. Galvanizing ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

(c) Write the chemical symbols for the following elements; 

1. Silver ………………………..
2. Iron ………………………….
3. Aluminium …………………….

6. (a) If a mixture of manganese (IV) oxide, MnO₂ with potassium chlorate, KClO₃ is treated, which of

     the two compounds will produce oxygen? 

1. …………………………………………………………………………………………………
2. Why? ………………………………………………………………………………………….

(b) Calculate the oxidation number of the underlined elements;

1. NH₄⁺
2. SO₄^2-
3. CUSO₄
4. FeCl₂

7. (a) List down four assumptions of the Dalton’s Atomic Theory;

1. ……………………………………………………………………………………………………
2. …………………………………………………………………………………………………
3. …………………………………………………………………………………………………
4. …………………………………………………………………………………………………

(b) Write a chemical formula for each of the following compounds;

1. Water …………………………………………………………..
2. Potassium chloride ………………………………………………
3. Magnesium oxide ………………………………………………….
4. Calcium hydroxide ……………………………………………….

(c) (i) What do you understand by the term “Chemical warning signs”? ……………………………………………………………………………………………………………

  (ii) Draw the chemical warning sign that represents; 

8. Study the periodic table below;

 I                                                                                        VIII

                                    II         III         IV         V         VI        VII

Use the letters shown in the periodic table above to indicate; 

1. Elements with zero valency …………………………
2. The lightest atom. …………………………………….
3. The alkaline earth match. ……………………………………
4. An element with electronic configuration of 2: 8: 1. …………………………..
5. Give the names of elements represented by the mentioned letters A, B, C and D. ……………………………………………………………………………………
6. Give the name of J as an element. ………………………………………………….
7. Write the electronic configuration of J. …………………………………………….
8. What type of a bond can be formed when element J combined with element H? ……………………………………………………………………
9. What type of a bond can be formed when an element H combines with an element H …………………………………………………………………

9. (a) What is air? ………………………………………………………………………………………………………………………………………………………………………………………………………………………….

(b) Mention the composition of air with their percentage composition; 

(c) Give four reasons why air is a mixture. 

1.  ……………………………………………………………………………………………………
2. …………………………………………………………………………………………………
3. …………………………………………………………………………………………………

                 iv       …………………………………………………………………………………………………

10. (a) Give the method used to separate the following mixtures;

1. Kerosene and water …………………………………………………………………………………
2. Alcohol (ethanol) and water ………………………………………………………………………..
3. Iron fillings and sand ……………………………………………………………………………….
4. Iodine crystals and table salt ……………………………………………………………………….

(b) Water is a chemical compound? Give four reasons to support this fact. 

1. ………………………………………………………………………………………………………
2. ……………………………………………………………………………………………………….
3. ……………………………………………………………………………………………………….
4. ………………………………………………………………………………………………………

Candidate’s Examination Number ________________________

THE PRESIDENT’S OFFICE MINISTRY OF EDUCATION, REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

CHEMISTRY MID TERM EXAMINATION-MARCH

FORM TWO-2021

Time: 2:30Hours

Instructions.

1. This paper consists of section A, and B with a total of 10 questions
2. Answer all questions in spaces provided.
3. Section A carries 20 marks, section B 80 marks.
4. All answers should be written in the spaces provided.
5. All communication devices, calculators and any unauthorized material are not allowed in examination room.
6. Write your number on every page of your answer booklet.
7. The following atomic masses may be used: H=1, N=14, O=16, S=32

SECTION A (20 Marks)

Answer All questions in this section.

1. For each of the items (i)-(x), choose the correct answer from the alternatives given.

1. Isotopes are atoms of the same element that have different

1. Atomic number
2. Electronic arrangement
3. Mass number
4. Protons

2. The process by which water is converted into water vapour or steam is called

1. Condensation
2. Evaporation 
3. Precipitation 
4. Transpiration

3. In the Bunsen burner a sooty flame is most likely to be formed when the

1. Air holes are fully closed 
2. Air holes are opened
3. Flame is noisy 
4. Flame is smaller

4. The best method to separate a mixture of iodine and iron is

1. Decantation
2. Evaporation to dryness
3. Fractional to dryness 
4. Sublimation

5. In scientific study, the tentative explanation of the observed chemical phenomenon can be proved by

1. Data analysis 
2. Experimentation
3. Hypothesis 
4. Observation

6. The choice of the source of heat depends on the_____

1. Colour of the flame 
2. Quantity of heat produced
3. Substance to be burned or boiled
4. Type and shape of the flame

7. When oxygen combines with metal they:-

1. Form metallic oxides
2. Form precipitation
3. Form rust 
4. Sublime

8. When dilute hydrochloric acid react with metal the product is______

1. Hydrogen chloride gas
2. Hydrogen gas
3. Chloride gas 
4. Hydrogen peroxide

9. Hydrogen react with sulphur to yield_______

1. Hydrogen sulphide 
2. hydrogen sulphate
3. Sulphur dioxide
4. Sulphur trioxide

10. The product smell obtained from the combustion of sulphur in air is_____

1. Pleasant 
2. Toxic 
3. pungent
4. Harmful

2. (a) You are provided with two list A and list B choose a statement which match the word in list A and write appropriate word in the space provided

(b) Fill the blanks for each of the following

1. _____________________is the smallest particle of an element that has all the chemical properties of that element.
2. _______________________is a negative charged particle with a mass of approximately equal to .
3. _________________________is the process of making water clean and safe for human consumption
4. __________________________is the process where y aluminium sulphate and impurities in water clump together and sink to the bottom of container
5. Water treatment is ________________________________________________________________________________________________________________________________________________

SECTION B (80 Marks)

3. (a) Use a diagram to explain the preparation of hydrogen using dilute hydrochloric acid and zinc granules

(b) Briefly explain four uses of hydrogen

(i)______________________________________________________________________________________________________________________________________________ (ii)_____________________________________________________________________________________________________________________________________________ (iii)_____________________________________________________________________________________________________________________________________________ (iv)_____________________________________________________________________________________________________________________________________________

4. (a) List four Dalton’s atomic theories

1. ____________________________________________________________________________________________________________________________________
2. ____________________________________________________________________________________________________________________________________
3. ____________________________________________________________________________________________________________________________________
4. ____________________________________________________________________________________________________________________________________

(b) State four modifications of Dalton’s atomic theories

1. ____________________________________________________________________________________________________________________________________
2. ____________________________________________________________________________________________________________________________________
3. ____________________________________________________________________________________________________________________________________
4. ____________________________________________________________________________________________________________________________________

(c) Mention two shortcomings of Dalton’s atomic theory

1. ____________________________________________________________________________________________________________________________________
2. ____________________________________________________________________________________________________________________________________

5. (a) Write down six physical properties of water

1. __________________________________________________________________
2. __________________________________________________________________
3. __________________________________________________________________
4. __________________________________________________________________
5. __________________________________________________________________
6. __________________________________________________________________

2. Give four reasons why water is important in our daily lives and industry.

1. ______________________________________________________________________________________________________________________________
2. ______________________________________________________________________________________________________________________________
3. ______________________________________________________________________________________________________________________________
4. ______________________________________________________________________________________________________________________________

6. (a) Give the meaning of each of the following sub atomic particles

1. Proton

____________________________________________________________________________________________________________________________________

2. Electron

____________________________________________________________________________________________________________________________________

3. Neutron

____________________________________________________________________________________________________________________________________

(b) Differentiate between physical and chemical change of matter (five differences)

(c) (i) Write the equation for the preparation of oxygen by heating potassium chlorate

(ii) How oxygen is tested in the laboratory

________________________________________________________________________________________________________________________________________________

7. (a) With chemical equation, give the product of combustion in oxygen of

1. A non metal ____________________________________________________________________________________________________________________________________
2. A metal , each of your own choice ____________________________________________________________________________________________________________________________________

(b) (i) Define catalyst ________________________________________________________________________________________________________________________________________________

(ii) In experiment of preparation of hydrogen, why copper (II) sulphate is added into the solution of zinc granules and dilute sulphuric acid? ________________________________________________________________________________________________________________________________________________

3. Why were the first few bubbles of gas not collected? ____________________________________________________________________________________________________________________________________
4. Write the word equation for the reaction during preparation of hydrogen gas by zinc granules __________________________________________________________________
5. Suggest two ways how hydrogen is collected during its preparation ____________________________________________________________________________________________________________________________________
6. Suggest one problem with collecting hydrogen by upward delivery, remember hydrogen is colourless ____________________________________________________________________________________________________________________________________

8. (a) Explain four methods of preventing rusting of iron (i)______________________________________________________________________ (ii)_____________________________________________________________________ (iii)_____________________________________________________________________ (iv)_____________________________________________________________________

(b) In the following diagram of interconverting of matter name the processes from a to f

1. _________________________________
2. _________________________________
3. _________________________________
4. _________________________________
5. _________________________________
6. _________________________________

9. (a) Study the diagram below and answer the questions that follow

1. What process is taking place? ____________________________________________________________________
2. Name the parts labeled A to D

1. ______________________________________
2. ______________________________________
3. ______________________________________
4. ______________________________________

(b) For each of the following classes of fire state the burning material and give its suitable fire extinguisher

10. (a) Draw the following warning signs as used in the laboratory, for each give two examples

(b) Define each of the following terms

1. Warning signs ____________________________________________________________________________________________________________________________________
2. Laboratory ____________________________________________________________________________________________________________________________________

THE PRESIDENTS OFFICE MINISTRY OF LOCAL GOVERNMENT AND REGIONAL ADMINISTRATION

FORM II CHEMISTRY MIDTERM MARCH-2021

1. For each of the items (i)-(x) choose the correct answer from among the given alternatives and write its letter in the box provided.

1. Which of the following does not constitute a fire triangle?

1. Oxygen
2. Fuel
3. Combustible material
4. Heat.

2. Why is oxygen regarded as one of the most important part of air?

1. It supports combustion
2. It is a diatomic gas
3. It forms the largest part of air
4. It has the largest density.

3. Which is not a property of oxygen gas?

1. Colorless
2. Odorless
3. Burns
4. Denser than air.

4. A simple proof that chemical reaction takes place in our bodies is that;

1. We occasionally fall sick
2. Doctors tell us in hospitals
3. The food or drink we take is different from the waste product produced
4. We cook food

5. A chemist will require the following skills except?

1. Experimentation
2. Observation
3. Problem identification
4. Surgery

6. Burning back in Bunsen burner occur when

1. Air hole is closed
2. Bunsen burner is overheated
3. Gas supply is high
4. Air hole is fully open

7. The most common source of heat in laboratory is

1. Kerosine stove
2. Liquefied petroleum
3. Spirit lamb
4. Bunsen burner

8. A gas was passed into test tube containing lime water. The lime water turned milky. The gas was mostly likely to be;

1. Sulphur dioxide
2. Carbon monoxide
3. Carbon dioxide
4. Nitrogen dioxide.

9. In which class of fire will you put kerosine?

1. Class A
2. Class B
3. Class C
4. Class E

10. What do you call an instrument used to hold and heat chemicals?

1. Measuring cylinder
2. Gas jar
3. Test tube
4. Funnel

2. Match the correct answer in list A with alternative given in list B by writing the answer of the correct answer in the spaces provided.

3. Complete the following statements with the correct answers

1. A substance that can burn is said to be . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. A gas that occupies the largest part of atmosphere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
3. Another name for anodizing as method of preventing rusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
4. Chemical name of rust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
5. Liquid obtained after distillation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

4. (a) Write six methods that can be used to prevent rusting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

(b) Mention the conditions required for rusting

5. (a) Which property of hydrogen make it to be used in the following ways

1. Oxyhydrogen flame
2. Weather balloon
3. Manufacture of margarine

(b) Which property of oxygen makes to be used as follows

1. Respiration
2. Cutting metals and welding
3. Removal of impurities

5. (a) Define the following terms

1. Laboratory
2. First aid
3. First aid kit
4. Matter

(b) Mention five laboratory rules

7. (a) Name the chemicals mostly used in laboratory to prepare oxygen.

(b) State the way you can test for presence of oxygen

(c) Explain four chemical properties of oxygen.

8. (a) By giving an example in each case, define the following terms

1. A chemical symbol
2. An element
3. A compound
4. A suspension

(b) Write the names of the elements presented by the following symbols

1. Au
2. Ag
3. Hg
4. P
5. Sn

9. (a) Mention five accidents that can happen in laboratory?

(b) State five ways we can do to minimize accidents in laboratory

10. (a) What is a flame?

(b) Mention two types of flames

(c) Explain why Bunsen burner is the best flame to use in laboratory

(d) Give differences between luminous and non-luminous flame

THE PRESIDENT'S OFFICE

MINISTRY OF REGIONAL GOVERNMENT AND LOCAL GOVERNMENT

AUGUST-SEPTEMBER   EXAMINATION SERIES

CHEMISTRY FORM-2

2020

TIME: 2:30 HRS

INSTRUCTIONS. 

1. This paper consists of sections A and B with a total of ten (10) questions.
2. Answer all questions in spaces provided.
3. All writing must be in blue or black ink except drawing which must be in pencil.
4. Calculators, cellular phones and any unauthorized materials are not allowed in the examination room.
5. Write your Examination Number at the top right corner of every page.
6. The following atomic masses may be used; H =1, N =14, O = 16, S = 32, Ca = 40

SECTION A (20 Marks)

Answer all questions in this section.

1. For each of the items (i) –(x), choose the correct answer from the among the given alternatives and write its letter in the box provide.

(i) Chemistry is defined as:

1. The scientific study of matter, compounds and chemical reactions
2. The scientific study of compounds, mixtures and organic substances
3. The scientific study of composition, structure and properties of matter
4. The study of relation between human being, medicine and pollution.

(ii) A non-luminous flame is the most applicable flame for heating purposes because:

1. It is very noisy
2. It has no soot
3. It is very hot
4. It has no colour

(iii) Matter is defined as anything that has:

1. Volume and occupies space
2. Mass and occupies space
3. Mass and occupies density 
4. Density and space

 (iv) Which of the following process is used in preventing rust of an iron?

1. Water
2. Boiling
3. Salting
4. Galvanization

 (v) Water is a universal solvent because:

1. It is available everywhere
2. It boils at 100⁰C
3. It dissolves most of the solutes
4. It dissolves all crystals in compounds

(vi) Which among the following are the two processes involved during distillation?

1. Evaporation and sublimation 
2. Evaporation and crystallization
3. Evaporation and condensation 
4. Evaporation and decantation

 (vii) Which of the following set of nuclide notation represents isotopes? 

1. ¹⁸ X ¹⁶ X ¹⁹ x 
2. ¹⁸ X ¹⁸ X X 
3.  ¹⁶ x ¹⁸ x ¹⁸90x 
4.  ¹⁶ X ¹⁷89x,

 (viii) The chemical used to test the presence of water in a substance is:

     A. Cobalt Il oxide                        B. Cobalt 111 oxide

    C.  Cobalt chloride     D.   Copper Il chloride

 (ix) When a burning fuel produces blue colour it means there is:

   A. adequate supply of oxygen with production of soot

   B. inadequate supply of oxygen with production of more heat.

  C. inadequate supply of oxygen with production of soot.

   D. adequate supply of oxygen with production of more heat.

(x) Which of the following is the best apparatus for measuring accurately a fixed volume of a given solution?

 A. Measuring cylinder          B. Beaker

   C. Pipette                            D. Burette

2. Match each item in List A with a correct response in List B by writing its letter bellow the number of the corresponding item in the table provided.

          SECTION B. 80 MARKS

3.(a) Define the following terms:

(i)Oxidation state

(ii)An element .......„

(iii)A compound

(iv)Fainting 

(b)Write the chemical formula for each of the following compounds:

(i)Sodium sulphate

(ii)Sodium chloride ..

(iii)Calcium nitrate ......... (iv) Calcium oxide .

4.Gas X can be prepared in the laboratory by the decomposition of hydrogen peroxide.

(a)Identify gas X ..

(b)State three physical properties of Gas X

Mention three chemical properties of gas X. (d) State three uses of gas X.

5.Write the name of each of the following compounds:

(i)(NH4)2C03

(ii)CaCl2

(iii) NaSO4

(iv) KC103

(b)Give three differences between the following:

(i)   Electrovalent compounds and covalent compounds. (ii) Solutions and suspensions.

6.(a) Define the following terms:

(i)Covalent bond

(ii)Electrovalent bond

(b)      A compound consists of 82.8% carbon and 17.2% hydrogen by mass. The vapour density of the compound is 29. Calculate:

(i)Empirical formula.

(ii)Molecular formula.

7.(a) Define the following terms as applied in Chemistry:

(i)Flame

(ii)Bunsen burner

(iii)Laboratory

(b)      List four properties of each of the following:

(i)       A luminous flame

(ii)     A non-luminous flame

8.(a) Write a word equation for each of the following reactions:

(i)Calcium burns in Oxygen .........

(ii)Sodium reacts with water ... ... ...

(b)      What do you understand by the following terms?

(i)       Water treatment

(ii)     Water purification

(c)       Mention six uses of water in economic activities.

9.(a) Mention four physical properties of water.

(b)      What will happen when:

(i)       a burning splint of wood is introduced into a gas jar containing oxygen gas 

(ii)     oxygen gas reacts with metals . 

(iii)   hydrogen gas reacts with oxygen gas .........